EP2188187A1 - Couvercle flexible davantage polyvalent et procédé de fabrication - Google Patents

Couvercle flexible davantage polyvalent et procédé de fabrication

Info

Publication number
EP2188187A1
EP2188187A1 EP08797173A EP08797173A EP2188187A1 EP 2188187 A1 EP2188187 A1 EP 2188187A1 EP 08797173 A EP08797173 A EP 08797173A EP 08797173 A EP08797173 A EP 08797173A EP 2188187 A1 EP2188187 A1 EP 2188187A1
Authority
EP
European Patent Office
Prior art keywords
sheet
cover
sides
elastic band
corner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08797173A
Other languages
German (de)
English (en)
Other versions
EP2188187A4 (fr
EP2188187B8 (fr
EP2188187B1 (fr
Inventor
Claus E. Sadlier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Touch Industries Inc
Original Assignee
Covermate Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Covermate Inc filed Critical Covermate Inc
Publication of EP2188187A1 publication Critical patent/EP2188187A1/fr
Publication of EP2188187A4 publication Critical patent/EP2188187A4/fr
Application granted granted Critical
Publication of EP2188187B1 publication Critical patent/EP2188187B1/fr
Publication of EP2188187B8 publication Critical patent/EP2188187B8/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
    • B65D41/22—Caps or cap-like covers with elastic parts adapted to be stretched over the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D55/00—Accessories for container closures not otherwise provided for
    • B65D55/02—Locking devices; Means for discouraging or indicating unauthorised opening or removal of closure
    • B65D55/06—Deformable or tearable wires, strings, or strips; Use of seals, e.g. destructible locking pins
    • B65D55/08—Annular elements encircling container necks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/02—Wrappers or flexible covers
    • B65D65/10—Wrappers or flexible covers rectangular
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1026—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina with slitting or removal of material at reshaping area prior to reshaping
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1028—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina by bending, drawing or stretch forming sheet to assume shape of configured lamina while in contact therewith

Definitions

  • the field hereof is container covers, especially covers that can cover a variety of container pr plate shapes and sizes.
  • the first is a fixed-size container lid which is sized and manufactured to fit a specific container.
  • plastic food storage containers such as those sold under the trademark Tupperware are generally sold with matching plastic lids. This approach requires that a specific matching lid be available to cover the container. The lid cannot be used on a different size or shape container.
  • the second type of system for covering plates as well containers is flexible plastic film and foil generally provided in a continuous sheet on a roll, such as rolls of plastic wrap sold under the trademark Saran or foil sold under the trademark Reynolds.
  • Saran or foil sold under the trademark Reynolds.
  • the user simply cuts a length of the film or foil and manually molds the cut film or foil over the container.
  • this system is flexible enough to cover containers of various sizes and shapes, it is often difficult to cut the film to the correct length and apply to a container without the film sticking to itself or its edges lifting from the container. Additionally it is difficult to re-cover a container with the same piece of film since plastic films loose their their ability to stick to the container after prolonged use and aluminum foils tear and become wrinkled.
  • foil is not transparent, and as such does not allow someone to see what is being stored in the container. And because it is metallic it can not be used in some microwave ovens.
  • the third type of plate and container covering system is a flexible film cover with an elastic band sewn along the edge.
  • SC Johnson Co. sells this product under their trademark Quick Covers.
  • This type of cover was originally developed and used as a shower cap and has been commercially available for many years.
  • This "shower cap” type cover is made from a circular sheet of plastic film with a strip of elastic sewn directly around the perimeter.
  • the second drawback of these covers is that the exposed elastic band emits an undesirable rubbery smell.
  • the third drawback is that these covers cannot be mass produced on high speed machinery.
  • the forth drawback is that these covers do not fit both elliptical and rectangular containers with similar size openings and therefore have relatively low versatility.
  • Patents 2,466,642 and 2,490,451 to Magid (1949) disclose a method of making a cover whereby an elastic band is heat sealed into a hem along the periphery of circular sheet of plastic film.
  • this design eliminates the unsanitary and undesirable smell and aesthetics of the traditional shower-cap type cover, these do not fit both elliptical and rectangular containers with similar size openings and therefore are not as versatile.
  • the process produces a cover whereby the sealed edge faces the outside of the cover (as shown in Fig 4 of the '451 patent). This makes the product look less finished and not esthetically pleasing. As a result these covers have never achieved commercial success, insofar as I am aware.
  • some advantages of one or more aspects are to provide an improved cover that a) can fit containers and plates a variety of shapes, b) has a cinching band that is more sanitary and esthetically pleasing, c) is made with a more aesthetically pleasing seam, d) can be made without having to form eight holes around the edge of the cover, and e) can fit a wider variety of sizes of containers,
  • Other advantages are to provide a cover that e) can be printed, f) can be used to reheat food in a microwave oven, g) can be easily manufactured, in one or more aspects h) can have perforations to allow steam to escape when used for reheating food in a microwave oven.
  • a more versatile flexible cover is formed from a rectangular sheet of plastic film material and a continuous elastic or rubber band.
  • the sheet preferably has a predetermined amount of material cut from each corner.
  • the sheet is placed onto a table between four posts that extend from the table.
  • the sheet is positioned so that a post lines up with each corner of the sheet.
  • a rubber or elastic band is stretched across the four posts into a square and rests just above the sheet.
  • the stretched band now has four sides which correspond to the four sides of the sheet.
  • each of the side edges of the sheet are folded inward and over the stretched band and heat sealed directly to the sheet.
  • the band is now sealed within a pocket that is formed around the edges of the sheet.
  • Each corner of the stretched band is then released from its post, which causes the band to relax and pull the four corners of the sheet toward the center.
  • FIG. IA is a plan view of a square film sheet used to make a more versatile flexible container cover.
  • FIG. IB is a partial plan view of an alternative corner cut configuration.
  • FIG. 1C is a partial plan view of another alternative corner cut configuration.
  • FIG. 2 is a perspective view of a relaxed elastic band used to make the cover.
  • FIG. 3 is a plan view of the sheet with the elastic band stretched around four corner posts and resting above the sheet.
  • FIG. 4A is a plan view of the sheet with each of the side edges folded over the elastic band and sealed to the sheet.
  • FIG 4B is a partial side- sectional view of the folded and sealed edge forming a pocket which contains the elastic band.
  • FIG 5 is a plan view showing the elastic band being released from the corner posts with arrows indicating the direction that the corners will be drawn in as the elastic band is relaxed.
  • FIG 6 A is a plan view showing the cover with the elastic opening at the top.
  • FIG 6B is a side section view of the cover of FIG 6A taken along the line 6B— 6B of FIG 6A showing the sealed edges facing the inside.
  • FIG 7 is a perspective view of the cover covering a round container.
  • FIG 8 is a perspective view of the cover covering a rectangular container.
  • Fig 9 is a plan view of a film sheet similar to that of Fig 1 but with an oblong rectangular shape.
  • FIG. IA shows a plan view of a thin plastic sheet 10 of film material that is used to make the flexible cover of Fig 6.
  • Sheet 10 is cut from a larger roll of material (not shown), the methods of which are well known in the industry.
  • the sheet is rectangular in shape in its free, unfolded and ungathered state and has four sides 1OS, where each pair of adjacent sides are 90 degrees apart.
  • a cut 1OC is made at each corner to remove a predetermined amount of material from each corner for reasons discussed below.
  • corner cuts preferably are done when the sheet is cut from the roll.
  • Each cut has a diagonal center portion and two outer portions, each of which is perpendicular to the respective adjacent side 10S.
  • the sheet preferably is made from any thin plastic film material such as polyethylene, polypropylene, nylon, polyethylene terephthalate (PET) or any combination of these and other materials. All of these materials can be used in a microwave oven. Additionally a biodegradable film can be used, such as polylactic acid (PLA) or polyvinyl alcohol (PVA) which contains starch in order to be biodegradable.
  • PLA polylactic acid
  • PVA polyvinyl alcohol
  • low density polyethylene (LDPE) preferably is used due to its ability to stretch, its lack of stiffness and its clarity.
  • the thickness of the material can be in a range of between 0.01 mm to 0.076 mm (0.0004 to 0.003 inch). In this first embodiment a square LDPE sheet that is 36 centimeters by 36 centimeters (14 inches by 14 inches) with a thickness of 0.025 mm (0.001 inch) is used.
  • the sheet has an oblong rectangular configuration with two short opposite parallel sides 10SS and two long parallel opposite sides IOLL and with curved cut corners 1OC" similar to that of Fi - 1 gO 1C.
  • each corner cut 1OC can have any other shape and size so long as it allows room for a post to hold the rubber band above sheet 10 as shown in FIG 3.
  • a plain diagonal cut 1OC may be made as shown in Fig IB or a curved cut 1OC" may be made as shown in Fig 1C.
  • FIG 2 shows of perspective view of an endless elastic band or loop 1 IR in a relaxed and unstretched state that is used to make the flexible cover.
  • the elastic band preferably is made from any thin elastic material such as latex (natural rubber), or latex-free material, such as polyisoprene, polyurethane, or a combination of these and other materials, in any color available. It has an unstretched or free length around its perimeter that is less than 50% of the length of the perimeter or periphery of the plastic sheet for reasons to be discussed below. All of these materials can be used in a microwave oven.
  • a white elastic band made from polyisoprene is used because it is a synthetic latex free material with good stretch characteristics.
  • the cross sectional dimension of the rubber band can have a width and a thickness in the range of between 0.127 mm to 6.35 mm (0.005 to 0.250 of an inch).
  • a polyisoprene band having a free or unstretched length around its perimeter of 30.5 centimeters (12 inches) with a square cross section (equal width and thickness) of approximately 1.5 mm (.060 inch) is used.
  • FIG 3 shows a plan view of sheet 10 lying flat on a table (not shown) with an inside surface 101 facing up, and with elastic band stretched 1 IS over the top of the sheet 10 and held in place by being secured around four corner holding posts 12 that project up from the table and are aligned with each corner of the sheet.
  • Each corner cut 1OC allows room for the post to hold the elastic band above the sheet without interfering with the folding process discussed below.
  • a marginal area of each side of sheet 10 extends outside of stretched band HS to form four elongated unfolded flaps such as lOUF.
  • FIG 4A shows a plan view of the four flaps IOUF folded over the elastic band to become folded flaps IOFF that are heat sealed to the sheet along a sealing area 13H to form a seam 13.
  • the process of heat sealing the plastic sheet to itself is well known in the art. This can also be seen in the partial side sectional view of FIG 4B.
  • Seam 13 is on the inside or upper surface 101 of the sheet which will form the inside surface of the cover.
  • An elongated pocket or sleeve 13P (Fig 4B) is formed at the seam between folded edge IOFE and sealing area 13H within which elastic band 1 IS is contained.
  • the cross-sectional area of pocket 13P as shown in Fig 4B should be at least 1.5 times as large as the cross sectional area of the elastic band in its stretched state. If the pocket is less than about 1.5 times the cross section area of the elastic band the sheet tends to bind up on the elastic band, restricting its ability to relax as will be detailed below.
  • FIG 5 shows a plan view of the elastic band 1 IS after release from the corner posts 12 and before band 1 IS contracts.
  • Fig 5 also shows an optional dot 16 that can be imprinted near one corner of sheet 10. Dot 16 makes it even easier for a user to identify the corners of the cover so that the corners of the cover can be aligned with the corners of a rectangular container. Any other suitable corner identifier can be used. Such marking preferably is done prior to cutting the sheet from the starting roll or, while the sheet is positioned on the table.
  • a hole or holes, perforations, micro perforations, or slits 17 can optionally be formed into the cover to allow steam to vent or escape more quickly from the cover as the food is being heated. Micro perforations are holes with a diameter of less than 0.5 mm (0.02 inch); these are small enough to prevent contaminates from entering the cover, but will allow steam to escape.
  • FIG 6A is a view of cover 15 with the opening 150 at the center and facing up. Opening 150 is bordered by seam 13, which is generally rectangular.
  • opening 150 has a near rectangular shape in its relaxed state (Fig 6A) because more pleats form in the corners due to the excess of material that gathers at each corner as shown.
  • near rectangular shape I mean that the shape appears to have four corners.
  • the near rectangular shape of the opening is beneficial because it allows the user to identify the corners of the cover before placing it on a rectangular container.
  • the rest of body 15B of the cover is generally circular in shape as if the starting sheet had been cut as a circle rather than a rectangle. The use of a rectangular starting blank thus makes the cover easier to fabricate because the corners can be more easily identified and aligned with holding posts 12 and provides flaps IOUF which can easily be folded over the elastic band.
  • opening 150 is simply stretched and the cover is placed over a plate (not shown) or a container 18S (Fig 7) or 18R (Fig 8) and released. This allows the elastic band to relax and contract, pulling the sheet tightly over the mouth of the container. Because of the rectangular shape of the starting sheet, the cover can be placed on both round containers 18R and square containers 18S with similar size openings. For example a cover that is sized to fit a 25.4-cm (10-inch) diameter circular plate will also fit a 25.4cm (10-inch) wide square food storage container. When the cover is placed over a rectangular container, the excess material in each corner is utilized to allow the cover to stretch over the corners of the container. When the same cover is placed over a circular container this excess material remains pleated or bunched in the cover, or the elastic can be pulled down the container further to stretch the excess material. This functionality is illustrated in Figs 7 and 8.
  • covers to fit larger size containers and plates can be made by using a larger size sheet and/or elastic band.
  • covers designed to fit smaller plates and containers can be made by using a smaller size sheet and/or elastic band.
  • the shape of the rectangular sheet can have equal length sides to form a square, or can have two sides that are longer than the other two. It can be translucent or opaque, as well as transparent.
  • the cutoff corners on the sheet can be omitted, in which case the corners can be folded inwardly to avoid the posts, whereafter the flaps and parts of the folded corners can be folded and sealed over the elastic band.
  • cutoff corners on the sheet can be omitted and the posts can be made short and pointed so as to pierce the corner portions, whereafter the corners as well as the flaps and can be folded and sealed over the elastic band.
  • the cover can be used to cover trays, beverage containers, laboratory containers, etc., as well a plates and food containers.
  • polypropylene nylon, or polyethylene terephthalate (PET) can be used in lieu of polyethylene.
  • Cast polypropylene for example is similar to polyethylene in is formability and clarity, but has a melt point that is approximately 100 degrees higher.
  • Nylon and PET are both used as materials for ovenable turkey bags and would provide a cover with an even higher operating temperature than polypropylene.
  • a biodegradable cover a biodegradable film such as polycarprolactone (PCL), polyvinyl alcohol (PVA) and polylactic acid (PVA) can be used. These polymers contain starch in order to biodegrade.
  • Different materials and different colors can be used for the elastic or rubber band.
  • a different color rubber band can be used to identify different size covers.
  • clear polyurethane bands can be used in lieu of colored rubber bands.
  • the cross-section of the band can be rectangular, oval, triangular, or circular, etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Package Specialized In Special Use (AREA)
  • Closures For Containers (AREA)
  • Wrappers (AREA)

Abstract

L'invention concerne un couvercle flexible formé d'une feuille rectangulaire de matériau de film plastique et une bande élastique ou en caoutchouc continue. La feuille a une quantité prédéterminée de matériau coupé à chaque coin. La feuille est placée sur une table entre quatre montants qui s'étendent depuis la table. La feuille est positionnée de sorte qu'un montant s'aligne avec chaque coin de la feuille. Une bande de caoutchouc est étirée à travers les quatre montants selon un rectangle de forme similaire et repose juste au-dessus de la feuille. La bande de caoutchouc étirée comporte alors quatre côtés qui correspondent aux quatre côtés de la feuille. Les bords latéraux de la feuille sont pliés vers l'intérieur et sur la bande étirée et thermoscellée directement sur la feuille. La bande est alors scellée au sein d'une poche qui est formée le long des côtés de la feuille.
EP08797173A 2007-08-16 2008-08-05 Procédé de fabrication pour un couvercle flexible d'avantage polyvalent Active EP2188187B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/840,019 US20090183807A1 (en) 2007-08-16 2007-08-16 More versatile flexible cover and method of manufacture
PCT/US2008/072196 WO2009023469A1 (fr) 2007-08-16 2008-08-05 Couvercle flexible davantage polyvalent et procédé de fabrication

Publications (4)

Publication Number Publication Date
EP2188187A1 true EP2188187A1 (fr) 2010-05-26
EP2188187A4 EP2188187A4 (fr) 2011-02-16
EP2188187B1 EP2188187B1 (fr) 2012-10-10
EP2188187B8 EP2188187B8 (fr) 2012-12-12

Family

ID=40351063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08797173A Active EP2188187B8 (fr) 2007-08-16 2008-08-05 Procédé de fabrication pour un couvercle flexible d'avantage polyvalent

Country Status (4)

Country Link
US (2) US20090183807A1 (fr)
EP (1) EP2188187B8 (fr)
CN (1) CN101827756B (fr)
WO (1) WO2009023469A1 (fr)

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US9445575B2 (en) * 2012-11-21 2016-09-20 Pet Food Express Absorbent pad configured for receiving waste
USD735535S1 (en) * 2013-02-14 2015-08-04 Fusionbrands Inc Versatile cover
EP2799360A1 (fr) * 2013-04-29 2014-11-05 Kim Jorgensen Holding, Sdr. Bjert ApS Procédé pour protéger le contenu d'un conteneur et utilisation d'un couvercle amovible souple à cet effet
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Also Published As

Publication number Publication date
WO2009023469A1 (fr) 2009-02-19
US20090183807A1 (en) 2009-07-23
EP2188187A4 (fr) 2011-02-16
CN101827756A (zh) 2010-09-08
US20100319840A1 (en) 2010-12-23
US8007615B2 (en) 2011-08-30
EP2188187B8 (fr) 2012-12-12
EP2188187B1 (fr) 2012-10-10
CN101827756B (zh) 2014-07-30

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